(19)

(11)

EP 4 144 002 A1

(12)

(43) Date of publication: 08.03.2023 Bulletin 2023/10 (21) Application number: 21740483.9 (22) Date of filing: 05.07.2021

(51) International Patent Classification (IPC):  H04L(2006.01) (52) Cooperative Patent Classification (CPC): H04L 67/1091; G06Q 20/02; G06Q 2220/00; H04L 67/02 (86) International application number: PCT/EP2021/068457 (87) International publication number: WO 2022/028791 (10.02.2022 Gazette 2022/06)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 05.08.2020 GB 202012134 (71) Applicant: nChain Licensing AG 6300 Zug (CH)	(72) Inventors: TARTAN, Chloe London W1W 8AP (GB) WRIGHT, Craig, Steven London W1W 8AP (GB) (74) Representative: Mahon, Thomas James et al Page White & Farrer Limited Bedford House 21A John Street London WC1N 2BF London WC1N 2BF (GB)